| 年份 | 也门共和国 |
|---|---|
| 2023 | - |
| 2022 | 3.79645 |
| 2021 | 3.8068 |
| 2020 | 3.99974 |
| 2019 | 4.13361 |
| 2018 | 4.20954 |
| 2017 | 4.30642 |
| 2016 | 4.38014 |
| 2015 | 4.48841 |
| 2014 | 4.60074 |
| 2013 | 4.66634 |
| 2012 | 4.71176 |
| 2011 | 4.74761 |
| 2010 | 4.77804 |
| 2009 | 4.81936 |
| 2008 | 4.8636 |
| 2007 | 4.91216 |
| 2006 | 4.8797 |
| 2005 | 4.69803 |
| 2004 | 4.58581 |
| 2003 | 4.58698 |
| 2002 | 4.61775 |
| 2001 | 4.68608 |
| 2000 | 4.77891 |
| 1999 | 4.82784 |
| 1998 | 4.88207 |
| 1997 | 4.94879 |
| 1996 | 5.16107 |
| 1995 | 5.75362 |
| 1994 | 6.26994 |
| 1993 | 6.35485 |
| 1992 | 6.41146 |
| 1991 | 6.45035 |
| 1990 | 6.47459 |
| 1989 | 6.50614 |
| 1988 | 6.56791 |
| 1987 | 6.55213 |
| 1986 | 6.1492 |
| 1985 | 5.88708 |
| 1984 | 5.82325 |
| 1983 | 5.74226 |
| 1982 | 5.65885 |
| 1981 | 5.5855 |
| 1980 | 5.51551 |
| 1979 | 5.39251 |
| 1978 | 5.30657 |
| 1977 | 5.23824 |
| 1976 | 5.18004 |
| 1975 | 5.09145 |
| 1974 | 5.0166 |
| 1973 | 4.95109 |
| 1972 | 4.89552 |
| 1971 | 4.8204 |
| 1970 | 6.2246 |
| 1969 | 6.11738 |
| 1968 | 6.05894 |
| 1967 | 5.9868 |
| 1966 | 5.91003 |
| 1965 | 5.85448 |
| 1964 | 5.74181 |
| 1963 | 5.68103 |
| 1962 | 5.72968 |
| 1961 | 5.73186 |
| 1960 | - |